99221-82-6

Heat-stableenterotoxin, (Escherichia coli strain 18D reduced)1-L-serine-2-L-serine-3-L-aspartic acid-4-L-tryptophan-4a-endo-L-asparticacid-7-L-aspartic acid-8-L-valine-18-de-L-tyrosine-